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Sony Repair Tips




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Search: sony
Results: 20072
Make Model Symptom Problem Solution By
SONY KP41T65
RA2 		Retrace Unit has a bright screen with retrace lines. When measuring the cathode driver pin on the cg socket with it connected to the tube we found 36 volts. when disconnecting the socket the voltage rises to 177 vdc. unit has defective crt a-1501-372-a Muller
SONY KP53S65
RA2 		Pip Kp53s65 serial 9141528. unit has a normal picture but it does not have luminance in the pip area. The pip and comb filter assembly are in the ""pt"" module. cn5001(5) is the sub video input for the pip signal. however the cn5051(14) is the luminance output is missing. the u & v signalscn5051( 16 & 15) are present. (they are the red and blue portions of the pip signal) tech needs to replace the ""pt"" module part # 1-665-394-12 "" Muller
SONY KV53V75
RA2 		No turn on Kv53v75 unit will not turn on. I had tech check continuity on the ac line cord which would measure the resistance of the stand by transformer. continuity was 570Ω which is good. next the tech needs to measure the input of ic641 it must be 20 volts. it was. the output of ic641 was ""0"" this ic is a 3 legged linear regulator with a generic # of 7812. it should have had a 12 "" Muller
SONY KP53V75
RA2 		No raster Kp53v75. 9057801 unit has no raster and cycling on and off every 2 seconds.. when turning up the g2 on any one of the crt's the crt will not have a complete raster but a glow that will be brighter on the top of the screen than the bottom. This symptom is generally indicative of a vertical failure. i had the tech measure the + & - 15 vdc from the main power supply at ps601 & ps602. ps601 was open causing the -15 volts to be missing. however two weeks later we were out again to replace both fuses. customer claimed as before the set was working fine the day before and he turned it on in the morning and it failed to have raster. this indicated the fuses were opening at ""turn on"" rather than failing while watching the set. it was indicated by sony tsound was going to be a bulletin on this unit that reduced the size of the filter capacitors on the + & - 15 volt lines, all 4 electrolytics are reduced from 1000 mfd to 470 mfd @ 25vdc. these are c656, c657, c815, & c889. after replacement no more "" Muller
SONY KP61V45
RA2 		No raster Kp61v45 serial 9000412 unit has no raster. unit appears to have high voltage but no filaments. Tech needs to inspect the filament winding continuity at cn766(5 & 4) at the blue crt socket with all crt's disconnected this resistance should be around 1Ω. in this case the unit was 53Ω. i instructed the tech to check into filament winding and r569. quick check of q569 found it had increased in value to over 50Ω. it is supposed to Muller
SONY KP53V75
RA2 		No high voltage Kp53v75 serial 9008493. unit is not turning on. the power supply turns on but it will not develop high voltage. I asked the tech to remove cn501 from the ""g"" board and try starting the set up again. the set turned on and developed high voltage. tech did not follow instructions in the bulletin #396. this area was covered in detail in the class. unit has a shorted red crt and burned video driver ic on the cr board. tech will need the crt, and the red "" Muller
SONY KP41T35
RA2 		Lines Kp41t35 unit has a symptom of an uneven pattern covers the entire screen. it consists of approx. 1/16th of an inch lines that are interlacing, kind of a basket weave look like. tech replace the flyback with no effect in the symptom. This symptom is known as line paring. i sent tech information on the symptom that may lead him to the conclusion that the jungle ic is at fault Muller
SONY KP41T35
RA2 		Lines Kp41t35 with lines in the pix, resembling arcing. tech saw this symptom several times in direct views and the solution has been the flyback. tech replaced the flyback and the divider block but still had the same symptom. it is the pattern covers the entire screen. the pattern consists of approx. 16th in lines that are interlacing, kind of a basket weave look. The name for this symptom is called ""line paring"" it is most likely caused by the jungle ic. suggest the tech try the set in the video input mode and see if the symptom shows in that mode before any more parts are replaced. after a short test it was determined the problem is not caused by the jungle ic because the set ran flawlessly in the video input mode. this really can only have 1 cause which will be the tuner. it was not mentioned in the first assessment of the symptom that it also had a roaring in the audio at the time of the line paring of basket weave interference across the screen. unit had bad tuner "" Muller
SONY KP53V75
RA2 		Lines Kp53v75 serial 9021573 unit has a vertical line in the middle of picture from top center left to lower center right side. Removing the screen finds the main reflector mirror is fractured down the center of the glass. Muller
SONY KP53V75
RA2 		Intermittent no raster Unit will run for days then it will go to no raster and no sound with stereo led flashing. The stereo led flashing is not the typical led is to indicate the system control is waiting for a acknowledgement from the jungle ic. when this set goes into the failure mode it kills raster and sound but high voltage remains. closer inspection also finds the set has high voltage with horizontal and vertical deflection. tracing the sda & clk signals finds the clk is running 3.5 volts pp and the sda runs at 5.1 volts pp. while the tech was working on tv the picture came back on again and the clk line climbed to 3.9 volts pp. it never climbed to 5.1 v pp like the sda line. tech isolated all the plug in boards to try to get the clk to rise to 5.1. only when the tu101 was disconnected the clk line went to 5.1 volts Muller
SONY KP41T35
RA2 		Ghost Kp41t35 serial 9102191 unit has ghost line across the screen. Tech will need the ""pt"" board. noise artifacts are seen while looking at the y signal out from this board. "" Muller
SONY KP53V75
RA2 		Dead Unit is dead. will not start up. just has the flashing red led on the front of the set. disconnecting the connector cn501( which removes the 200 vdc load created by all 3 crt drive modules) does not allow the set to turn on. Tech did not measure any voltages on the ""g"" board. these must be confirmed before we can possibly know wsound to go looking for what might be wrong. it is possible nothing is shorted in the power supply and we has an open start up resistor in the base circuits of ic601. tech needs to check r609, r610, r611, r612. all are 220k and have been known to open causing a ""dead set"" condition. "" Muller
SONY KP53V75
RA2 		Dead Kp53v75. unit is dead. will not start up. just has the flashing red led on the front of the set. disconnecting the connector cn501( which removes the 200 vdc load created by all 3 crt drive modules does not allow the set to turn on. Tech did not measure any voltages on the ""g"" board. these must be confirmed before we can possibly know wsound to go looking for what might be wrong. it is possible nothing is shorted in the power supply and we has an open start up resistor in the base circuits of ic601. tech needs to check r609, r610, r611, r612. all are 220k and have been known to open causing a ""dead set"" condition. "" Muller
SONY KP46C36
RA2 		Dead Kp46c36 serial 9002356. unit is dead. c608 the main raw b+ filter capacitor is vented along with ic6601 shorted. It apparent the television either had a significant a.c. line voltage surge or c608 just took this time to blow. either way the tech should replace c607, & c608 along with ic601. Muller
SONY KP46C36
RA2 		Dead Kp46c36 serial 9010238. unit has shorted horizontal output transistor for the third time. all three crt's have been replaced two months ago. all has been well up to this point. the set failed again now we are faced with changing the crts again but we are at this point are going to replace the ""g"" board in its entirety "" Unit has shorted horizontal output transistor. ""g: board must be replaced as a complete assembly. also all three crts are burned again. "" Muller
SONY KP53S35
RA2 		Dead Sony kp53s35 ra-2 chassis. unit is dead. tech ordered q601 in the ""g"" board power supply section. no change in the symptom. "" After replacement, voltage checks indicated the e2, and b2 voltages at ic601 were 340 volts. e1 and b1 were always ""0"". one of the soft start resistors, r614 was open. r612, r613, r614, & r615 are responsible for the initial start up of this power supply. "" Muller
SONY KP46S25
RA2 		Crt Unit has no output from the blue crt. swapping the green to the blue socket does not transfer the trouble. Unit will need the blue crt. g2 voltage running at 33 vdc on blue crt Muller
SONY KP53S35
RA2 		Crt Kp53s35 unit has a logo of bugs life burned into the red crt. Unit will need the red crt. this should be an icb to the store since this was damage caused by leaving a dvd player connect to the set with the bugs life cd in side. when not playing, and in the standby mode the logo will appear. since the logo never moves and over a prolonged period of time the crt's can be permanently damaged with an image burn in the phosphor Muller
SONY KP53S25
RA2 		Crt Kp53s25 serial 90222755 tubes are burned from the pip screen being on the screen for an excessive period of time Ok for crt replacement Muller
SONY KP46C36
RA2 		Crt Kp46c36 serial 9005538 . unit has a burn in the blue crt. the unit has an excessive afterglow once the television is turned off. the after glow is only blue. no other colors have this afterglow. Tech will need replacement crt07mac02b Muller